My strcpy_s won't work with my char *pointer, why?

Question

Ok, so I am trying to fix my C++ assignment, but when I use strcpy_s it only works for my array and not my *pointer.. here is what I am working with:

HotelRoom::HotelRoom(char Num[], int cap, double daily, char* name, int Stat)
{
strcpy_s(room_Num, Num); //copy first argument into room_Num[]
guest = new char[strlen(name) +1]; //create space for the name
strcpy_s(guest, name); //copy second argument into new space
capacity = cap;
dailyRate = daily;
occupancyStat = Stat;
}

This is the error I get when using it in this manner strcpy_s(guest, name); :

"no instance of overloaded function "strcpy_s" matches the argument list argument types are: (char*, char*)".

Answer 1

The non-standard strcpy_s takes one extra parameter than std::strcpy that is the max size you want to copy.

errno_t strcpy_s(char *s1, size_t s1max, const char *s2);

What you need is the standard C function std::strcpy.

char *strcpy(char *s1, const char *s2);

Answer 2

Take a look at the documentation: http://msdn.microsoft.com/en-us/library/td1esda9%28v=vs.90%29.aspx

When the size cannot be determined automatically because a statically sized array is not being passed you must provide it.

#include <string.h>

int main()
{
    char src[] = "Hello World!\n";
    char staticDest[100];
    size_t dynamicSize = strlen(src) + 1;
    char* dynamicDest = new char[dynamicSize];

    //Use the overload that can determine the size automatically
    //because the array size is fixed
    //template <size_t size> errno_t strcpy_s(char(&strDestination)[size], const char *strSource);
    strcpy_s(staticDest, src);

    //Use the overload that requires an additional size parameter because
    //the memory is dynamically allocated
    //errno_t strcpy_s(char *strDestination, size_t numberOfElements, const char *strSource);
    strcpy_s(dynamicDest, dynamicSize, src);

    return 0;
}

Answer 3

The following should work:

strcpy_s(guest, strlen(name), name); //copy second argument into new space